Aircraft heat exchangers and plates

1. A heat exchanger for providing heat transfer between a first flow along a first flowpath and a second flow along an arcuate second flowpath, the heat exchanger comprising:

an inlet manifold having at least one inlet port and at least one outlet port;

an outlet manifold having at least one outlet port and at least one inlet port; and

at least one plate bank comprising:

a plurality of plates, each plate comprising a body mounted to the inlet manifold and the outlet manifold and having:

at least one inlet port along the first flowpath and at least one outlet port along the first flowpath;

a first face and a second face opposite the first face;

a leading edge along the second flowpath and a trailing edge along the second flowpath;

an inner diameter edge; and

an outer diameter edge, a thickness of the body between the first face and second face tapering along a first region in an inward radial direction from the outer diameter edge to the inner diameter edge; and

fin arrays between adjacent said plates spanning between the first face in the first region of one said plate and the second face in the first region of the other said plate, the fin arrays each formed by a wave form sheet metal piece having essentially uniform wave amplitude.

2. The heat exchanger of claim 1 wherein, for each plate of the plurality of plates:

the at least one inlet port and at least one outlet port are along one of the inner diameter edge and the outer diameter edge.

3. The heat exchanger of claim 1 wherein, for each plate of the plurality of plates:

the inlet manifold and outlet manifold are portions of a combined manifold structure.

4. The heat exchanger of claim 3 wherein:

the combined manifold structure is arcuate having a concave inner diameter face, the plates mounted to the inner diameter face.

5. The heat exchanger of claim 4 wherein, for each plate of the plurality of plates:

the at least one inlet port and at least one outlet port are along the outer diameter edge.

6. The heat exchanger of claim 1 wherein, for each plate of the plurality of plates:

the at least one inlet port and at least one outlet port are along the outer diameter edge.

7. A gas turbine engine including the heat exchanger of claim 1 and further comprising:

a bypass flowpath forming the second flowpath.

8. A method for using the heat exchanger of claim 1 , the method comprising:

passing the first flow along the first flowpath; and

passing the second flow along the second flowpath to transfer said heat from the first flow to the second flow.

9. The method of claim 8 wherein:

the second flow passes along the plate first faces and plate second faces.

10. The heat exchanger of claim 1 wherein, for each plate of the plurality of plates:

along at least 8.0% of a height between the outer diameter edge and the inner diameter edge, the first face and the second face converge at a first angle of at least 0.25°.

11. The heat exchanger of claim 10 wherein, for each plate of the plurality of plates:

said at least 8.0% of a height between the outer diameter edge and the inner diameter edge is a continuous zone and the first angle is uniform along said continuous zone.

12. The heat exchangers of claim 10 wherein, for each plate of the plurality of plates:

the plate has a plurality of interior walls separating legs of the at least one passageway at a progressively increasing spacing from outer diameter to inner diameter.

13. The heat exchanger of claim 10 wherein, for each plate of the plurality of plates:

along at least 50% of a height between the outer diameter edge and the inner diameter edge, the first face and the second face converge at a first angle of between 0.25° and 5.0°.

14. The heat exchanger of claim 10 wherein, for each plate of the plurality of plates, the passageway comprises:

an inlet plenum extending from the at least one inlet port of the plate;

an outlet plenum extending to the at least one outlet port of the plate; and

a plurality of legs in parallel between the inlet plenum and the outlet plenum.

15. The heat exchanger of claim 14 wherein, for each plate of the plurality of plates:

the inlet plenum is adjacent the trailing edge; and

the outlet plenum is adjacent the leading edge.

16. The heat exchanger of claim 1 wherein, for each plate of the plurality of plates:

along an outer diameter portion, the first face and the second face converge at a first angle; and

along an inner diameter portion, the first face and the second face converge at a second angle less than the first angle.

17. The heat exchanger of claim 16 wherein, for each plate of the plurality of plates:

along the outer diameter portion, the body has integral fins; and

along the inner diameter portion, the plate has sheetmetal fins secured to the body.

18. The heat exchanger of claim 16 wherein, for each plate of the plurality of plates:

the first angle is at least 0.25° greater than the second angle.

19. The heat exchanger of claim 16 wherein, for each plate of the plurality of plates:

the second angle is 0.0°.

20. The heat exchanger of claim 16 wherein, for each plate of the plurality of plates:

the outer diameter portion extends for a height of at least 8% of a height from the outer diameter edge.

21. The heat exchangers of claim 16 wherein, for each plate of the plurality of plates:

along the outer diameter portion, the plate has a plurality of walls at a progressively increasing spacing from outer diameter to inner diameter.

22. The heat exchangers of claim 21 wherein, for each plate of the plurality of plates:

along the inner diameter portion, the plate has a plurality of walls at a constant spacing.

23. The heat exchanger of claim 16 wherein, for each plate of the plurality of plates, the body comprises a cast substrate.